PubMed 13. Maresh CM, Farrell MJ, Kraemer WJ, Yamamoto LM, Lee EC, Armstrong LE, Hatfield DL, SHP099 purchase Sokmen B, Diaz JC, Speiring BA, Anderson JA, Volek JS: The effects of betaine supplementation on strength and power performance. Med Sci Sports Exerc 2008, 39:S101. 14. Hoffman JR: Norms for Fitness, Performance, and Health. Momelotinib order Human Kinetics: Champaign, IL 2006. 15. McNair DM, Lorr M, Droppleman LF: Profile of Mood States Manual. San Diego, CA: Educational and Industrial Testing Service 1971. 16. Zahn A, Li JX, Xu ZR, Zhao RQ: Effects of methionine and betaine supplementation on growth performance,

carcase composition and metabolism of lipids in male broilers. Br Poult Sci 2006, 47:576–580.CrossRef 17. Delgado-Reyes CV, Wallig MA, Garrow TA: Immunohistochemical detection of betaine-homocysteine S-methyltransferase in human, pig, and rat liver and kidney. Arch Biochem Biophys 2001, 393:184–186.CrossRefPubMed 18. Storch KJ, Wagner DA, Young VR: Methionine kinetics in adult men: effects of dietary betaine on L-[ 2 H 3 -methyl-l- 13 C] methionine. Am J Clin Nutr 1991, 54:386–394.PubMed 19. Wise CK, Cooney CA, Ali SF, Poirier LA: Measuring S-adensylmethionine in whole blood, red blood cells and cultured cells using a fast preparation method and high-performance chromatography. J Chromatogr B Biomed Sci Appl 1997, 696:145–152.CrossRefPubMed 20. Hoffman JR, Ratamess NA, Kang click here J, Mangine G, Faigenbaum AD, Stout JR: Effect of Creatine

and

β-Alanine Supplementation on Performance and Endocrine Responses in Strength/Power Athletes. Int J Sport Nutr Exerc Metab 2006, 16:430–446.PubMed 21. Wilder N, Gilders R, Hagerman F, Deivert RG: The effects of a 10-week, periodized, off-season resistance-training program and creatine supplementation among collegiate football players. J Strength Cond Res 2002, 16:343–352.PubMed 22. Hoffman JR, Stout JR: Performance-Enhancing Substances. Essentials of Strength and Conditioning 3 Edition (Edited by: Earle RW, Baechle TR). Human Kinetics: Champaign, IL 2008, 179–200. 23. Hoffman JR, Kang J: Strength changes during an inseason resistance training program for football. J Strength Cond Res 2003, 17:109–114.PubMed 24. Hoffman JR, Wendell M, Cooper J, Kang J: Comparison between linear and nonlinear inseason training programs in freshman football players. J Strength Cond GPX6 Res 2003, 17:561–565.PubMed 25. Liversedge LA: Glycocyamine and betaine in motor-neuron disease. Lancet 1956, 2:1136–1138.CrossRef Competing interests Danisco-USA, (Ardsley, NY) provided funding for this project. All researchers involved collected, analyzed, and interpreted the results from this study and have no financial interests concerning the outcome of this investigation. Publication of these findings should not be viewed as endorsement by the investigators, The College of New Jersey or the editorial board of the Journal of International Society of Sports Nutrition.